Americans love hot dogs, but most couldn't (or wouldn't want) to tell you what's in them. Americans love listening to rap music, but many probably can't relate to struggles of gang violence and urban poverty, nor excessive wealth and fame. Americans are quite particular about what car they drive, but nobody except your local enthusiast (or maybe your Uncle Jim) could tell you much about how they work.
For generations, Americans have had an obsession with the British Royal Family, and the institutions of monarchy in general, even though it is, er, not our form of government, nor does anything they do really affect us in any way.